Creatine for Your Brain: What Trials Show for Memory, Sleep Loss and Depression

A 2024 meta-analysis pooled 16 randomized trials with 492 participants aged about 21 to 76, including healthy people and people with specific diseases; all used creatine monohydrate². It reported better memory (standardized effect 0.31, moderate certainty) and, with low certainty, better attention time and processing speed, but no change in overall cognitive function or executive function². The authors declared no conflicts of interest². In 2024, assessing a health-claim application from the creatine maker AlzChem, the European Food Safety Authority concluded that a cause-and-effect link between creatine and better cognitive function had not been established, and said no conclusions could be drawn from this meta-analysis because it pooled several related tests from the same people, double-counting participants¹⁴. Our creatine page covers the wider evidence.

An earlier meta-analysis limited to healthy people pooled 8 trials with 225 participants and first reported an overall memory effect of 0.29, concentrated in adults aged 66 to 76³. One author sits on the scientific advisory board of AlzChem and has received creatine donations and industry-sponsored research funding; another previously advised a company that sold creatine³. A published letter pointed out that the analysis had double-counted participants, which raises the risk of a false-positive result⁴. In their reply, the authors accepted the error and re-ran the analysis: the overall memory effect was no longer significant (0.19), young adults showed no benefit, and only adults aged 66 to 76 still improved (0.80)¹³.

People who eat little or no meat have been thought to have more to gain, but the evidence is mixed. In an Australian crossover trial, 45 young vegetarians took 5 g a day for 6 weeks and improved on a working-memory test and a reasoning test⁵. In a Welsh trial of 128 young women given 20 g a day for 5 days, memory improved in vegetarians but not in meat eaters, and verbal fluency and vigilance did not change in either group⁶. The largest trial so far, a preregistered German crossover study of 123 adults (about half vegetarian) taking 5 g a day for 6 weeks, found no statistically significant effect on the same two main tests (the working-memory result was borderline), no sign of benefit on eight other tasks, and no extra benefit in vegetarians; the authors concluded creatine might have a small effect, and side effects were reported more often on creatine¹⁵.

For age- and sex-specific angles, see creatine in older adults and creatine for women in menopause.

In a Korean double-blind trial, 52 women with major depressive disorder took the antidepressant escitalopram plus either creatine (3 g a day for the first week, then 5 g a day) or placebo for 8 weeks⁸. The creatine group improved more on the Hamilton depression scale from week 2, and the gap held at weeks 4 and 8⁸. Dropouts (32.0% versus 18.5%) and overall adverse events did not differ significantly between the groups⁸. The trial was funded by NARSAD, Korean government research grants and US National Institutes of Health and Veterans Affairs grants; one author disclosed that he is an inventor on related patent applications, and he did not take part in assessing participants⁸.

These trials tested creatine added to standard care, not instead of it, and the safety signal matters. In a small open-label Israeli study of 10 people with treatment-resistant depression given 3 to 5 g a day for 4 weeks, the seven unipolar patients who stayed in improved, but both patients with bipolar depression developed hypomania or mania⁹. In a Brazilian double-blind trial of 35 people with bipolar depression, 6 g a day added to their usual medicines did not beat placebo on the main depression score after 6 weeks, though more people on creatine reached remission, and two of the 17 people taking creatine switched to hypomania or mania early in the trial¹².

Creatine's brain evidence is thinner than headlines suggest: once double-counting is corrected, the memory benefit holds mainly in older adults, the largest trial found at most a small effect, one study suggests help during sleep loss, and a promising depression trial comes with a clear bipolar caution^{13,14,15,8,9,12}. Gummies and other formats raise their own dose questions; see creatine gummies vs powder.